package com.example.helloworld;

public class SuperClass{

    public static void main(String[] args) {
        int a = 10;
        int b = 20;
        String s = "Hello World";

        System.out.println(a+b);
        System.out.println(a-b);

        System.out.println(a*b);
        System.out.println(b/a);
        System.out.println(b%a);
        System.out.println(b++);  // 20   后加1    21
        System.out.println(++b);  // 21 + 1    22
        System.out.println(a!=b);
        System.out.println(a>=b);
        System.out.println((a * b ) == (a *= b));
        System.out.println(a);
        System.out.println((a == b) ? "a==b" : "a!=b");

        boolean result = s instanceof String;

        System.out.println(result);
    }

}